Pump mechanism



Patented Apr. l8,

UNITED STATES. PATENT omen HARRY A. PALMER, OI BOSTON, ASSIGKOB TO more INCORPORATE), A CORPORATION 01' rune Application fled Alix-11', 1938. Serial No.

This invention relates to a pump mechanism designed primarily for supplying fuel to the combustion chamber of an internal combustion; engine, but it is to be understood thata pump mechanism, in accordance with this invention may be employed in any connection for which itis found applicable, ,and the invention has for its object to provide, in

a manner as hereinafter-set forth, a mecha- 19 nism of the class referred to so constructed and arranged whereby its intake action for .the fuel will be had on the compression stroke of the engine and the ex lling action of the pump for injecting the el into the combuson and before the completion of .the compression stroke of the engine.

A further object of he invention is to provide, a pumping mechanism for the purpose set forth, including a plunger element, acting to seal the intake to and outlet from the plunger chamber of the pumi until the start of the compression stroke of t e engine there by preventing'leakage and siphoning of oil during the other cycles of the engine."

A further object of the invention is to pro- I vide, in a manner as hereinafter set forth, a mechanism of the class referred to'including an oil expelling plunger. acting to instantly cut off the fuel to the plunger c amber at-the expiration of the :ex'pelling action of. the

y A further object of the invention is to rovide, in a manner as hereinafter set fort a pumping mechanism having itsioperation for intaking fuel thereto for expulsion to the combustion chamber of the engine, so timed to prevent the fuel intakingpperation of a com-. bined fuel intaking and el expelling plunger until the piston of the engine starts .up on its compresslon stroke. I

To the above ends essentially and to others which m'ayhereinafter appear, the invention consists of such parts, and such combination of parts which invention as claimed.

The pumping mechanism as hereinafter more specifically referred to is similar to that disclosed in my co-pending application, part Serial Number 608,329, filed April 29, 1932.

A I In the drawings:

tion chamber of the engine will also be had all within the scope of the Figure 1 is a lengthwise sectional view of Y Y.

a fuel pumping'mechanism in accordance-Q with thisfinvention illustrating'theplunger of the mechanism in fuel intaking position. T

' Figure 2 is a section on line 2-2 Figure 3 is a sectional view taken at right angles to Figure 1. f 3

Figure 4 is a s'ection on line 44; Figure 3. Figure 5 is a fragmentary view in'section 00 online5--5Figure 6. n v Figure 6 is a-view similar to Figure 1, illustratin the plunger of the mechanism atthe end 0 its expelling stroke.

Figure 7 is a fragmentary view ,in section. on line 7-7 Figure 6; Referring to the drawings, 1 indicates a pump casing open at its topand formed with a bottom 2 provided with a central enlarged. opening 3. Extended from casing 1 is a pair of spaced parallel arms 4, 5, the former is provided with. an opening 6 in which is arranged] .an eccentric bearing 7.

s d b Tlie arm 54hasard1 o nin'S. u o e yt earms ,5' an T 'm sunt l thereifi is a throttle shaft'9,formed 7 ofan enlarged intermediate pa'rtlO and a. pair of reduced end parts 11, 12. The part 10 has one end thereof seated in opening 8. Theend part 11 extends through'bearing collar 7 and carries a lock ring 13, The part 12 has connected thereto, by the binding screw 14 a control .15for shaft 9. The bearing 7- .is keyed to part 11 of shaft 9. The purpose of bearing 7 will be presently referred to.

,Seated on the open top of and extended into casing 1 is a pump body 16 formed of a centrally circular apertured head. part 17 and 'a cylindrical guide part 18, the former bein of .a width greater than the diameter-of an integral at its inner end with the latter. The 99 wall of the aperture or inner side of part 17 is upon two different diameters. That pertion of the inner side of part 17 .of-greatest inner diameter is'indicated at 19 and that portion of smallest inner diameter at 20. The. portion 19 is of less length than portion. 1 20, and opens at the outer end of the'headpart 17. "The providing of the inner side of 17 of two difierent diameters forms 'an internal shoulder or seat 21. The portion 19 9 of the inner side of part 17 is threaded. The inner diameter of part 18 is uniform throughout and is the same as and forms a continuation of the portion 20 of the inner side of part 17.. The latter is rabbeted on its outer side, as at 22 to provide for part 17 to seat on the outer end edge of and extend into the casing 1. The pump body 16 is secured to I casing 1 by holdfast devices 23. A part of the portion of the inner side of part 17 and the entire inner side of part 18 provides a chamber 24 for a combined fuel intaking and fuel expelling reciprocatory plunger 25 which has a snug sliding fit with the wall of chamber 24. The latter isopen at its inner end and closed at its outer end by a peripherally threaded and shouldered plug 26 formed with a port 27 extending from the inner end of and opening into a valve pocket 28 formed in theplug intermediate its ends. The plug 26 is formed with an annular opening 29 of greater diameter than and which opens at its inner end into pocket 28. The outer end of opening 29 communicates with a cavity 30 formed in the outer end of plug 26. The wall of opening 29 is threaded. The plug 26 has a reduced inner part 26 which extends into the portion 19 of the inner side of part 17 of pump body 16. The peripheral shoulder of the plug engages a packing 26" mounted on seat 21. The threads of the plug engage with the threaded portion 19 of the inner side of the pump body 16. The plug 26 extends outwardly from the latter.

Secured to the wall of opening 29 is a tubulax-coupling member 31 formed of an intermediate, an outer and an inner part 32, 33

and 34 respectively. The part 32 is of greater diameter than parts 33, 34. The part-33 is of greater outer diameter than part 34. The inner diameter of parts 32, 33 is the same, but of less diameter than the inner diameter of part 34. The parts 33, 34 are peripherally threaded. The part 34 engages with the wall of opening 29 and has its innerdiameter the same as the diameter of pocket 28. Part 32 is arranged within and extends from cavity 30. At the point of mergence of part 34 with part 32, a valve seat 35 is formed for a ported valve 36 of T-shape cross section. Arranged within part 34, surrounding the stem of valve 36 and interposed between the head of the latter and a check valve 37 is a controlling spring 38. The valve 37 is normally ar-.

ranged in pocket 29. The stem of valve 36 is spaced from valve 37 and constitutes a stop for the arresting of the opening movement of the latter. Extended into the outer end of part 33 is a fuel conducting pipe 39 which leads to an ejector nozzle, not shown, for extension into the combustion chamber, not shown, of the engine. A packing 40 surrounds pipe 38 and is seated on the outer edge of part 33. A packing gland 41 surrounds pipe 39, encloses packing 40 and threadedly posed at right angles to chamber 24 and has I 1ts top wall 43' below and in very close proximity to the inner end of plug 26. The bottom wall 44 of chamber 42 is arranged in close proximity to the inner end of plug 26. Communication is had between the chamber 42 and the upper end of chamber 24 by a series of spaced ports 45 in the wall 43. The arrangement is such that when the plunger 25 moves inwardly about .006 of an inch, the intake from chamber 42' to chamber 24 starts. The part 17 of pump body 16 is formed with a circular opening 46 having the wall thereof threaded for securing thereto a fuel supply nozzle 47 The opening 46 communicates with the open outer end of chamber 42 and nozzle 47 llkewise. The nozzle 47 comprises a tubular body portion 48 having an enlarged outer part 49 and a reduced inner part 50, the latter being peripherally threadedto secure it to the threaded wall of opening 46. Arranged within part 49 is a collar'51 carrying a valve stop 52. Positioned in part 49 and bearing against the outer end edge of collar 51, is a sleeve 53, having its inner end formed with a valve seat 54. The outer end 55 of sleeve 53 is beveled. Slidably mounted in sleeve 53 is the stem of a check valve 56 which coacts with the seat 54 for closing the nozzle 49 to supply and to arrest any outward expulsion of the fuel from chamber 42 from passing to the supply or feed pipe 57, which is clamped against the outerend of sleeve 53 by'aitubular plug 58, mounted on pipe 57 and threadedly engaging with the inner, face of part 49 at the outer end of the latter.

The plunger 25 is formed with an annular peripheral shoulder 59 for a purpose to be referred to. Surrounding and extending inwardly from the part 18-of the pump body 16, is a reciprocatory driver 60 for the plunger 25, and which acts upon. the latter to provide its fuel expelling stroke. The driver 60 coacts with the shoulder 59. The driver 60 includes a sleeve 61 formed at its outer end with an outwardly directed annular flange The driver 61 and is interposed between flange 62 and the bottom 2 of easing er 25, are abutment mem rs 68 each avin a flat working surface 69..

Pivotally mounted on art 11 of shaft 9,

is a pawl 70 for shifting p unger 25 inwardly to provide for driver 60 to compress spring bifurcated inner part to form a pair 0 64. The pawl includes a centrally aperturedintermediate part 71, an outer end part 72 formed with a and a Spaced arms 74 for straddlin the 'portion- 65 of plunger 25. The arms 4 have flat working surfaces 7 5v for seating upon the working surepending nose 73f,

faces 69 of the abutment members 68,' The arms 74 are maintained against surfaces 69 by a retaining s ring 76 which surrounds the 'irmer portion 0 plunger 25 and is interposed between flange 63 and the upper edges of arms74. a p Arranged adjacent to and below shaft 9 is a stationa 78, 78' and aving a peripheral combined sto and spacing boss 7 9.in proximity to one en The support 78 carries a combined spacing and stop sleeve 80. Revolubly mounted on shaft 77 betweenbos 79 and collar 80 is a cam operating shaft 81. The

cam, indicatedat 821s 1nte al with shaft 81 at one end of the latter. tegral with the other end ofshaft 81 is a npheral collar 83. encompassed and driven om a driver 84, which is connected to and operated from any suitable means, not shown, actuated from the engine. The arrangement is to be such that shaft 81, cam 82, collar-83 and driver 84 will revolve tofi ther bodily, except when the engine back- The driver The-collar 83 is cut out on one side, as at 86 to provide a shoulder 87. 1 Arran with-. in pocket and engaging the shou der 87 is a. spring controlled latch 88 which couples the collar and driver 84 together to provide for the bodily movement re erred to. When 50 the engine backfires and reverses, the moveopposite y disposed lobes 91, 92.

ment-of driver 84, the cam shaft 81 remainsstationa ,.until the driver 84 operates-in its normal irectionand the latch-88 engages shoulder 87 The cam 82 isformed with a pair of ogpositelf disposed working surfaces 89, 90 w 1ch gr uall rise and terminate into a pair of The nose 73 of pawl 70, travels successively upon the surfaces 89, 90" from the low part to the. high part of the latter, whereby the pawl 70 is shifted pn its shaft 9. in a manner to lower the; arms74 thereof, .until the nose 73 clears [the lobes anddrops u n the low parts of the surfaces 89,90. en the v plun chamber 24.- shaft 77 mounted in supports es'fand'causes the driver to operatereversely. i c 84 is formed with apocket 85.

W170 is shifted to lower its arms 74, the. atter the members 68, will 7 shift the plunger 25 inwardly to open the fuel intake chamber Q to the chamber '24 drawingfuel into the latter forwardly of r 25. When the latter is moved inwar y, the shoulder 59 hearing against flange 63, will carry driver 60 therewith com-' Pm mg a lobe the dnver 60 will be released and spring 64 acting upon the latter will project spring 64. Upon the nose 73 clear driver 60 outwardly, which carries the plunger 25 therewith and'provides the fuel expelling stroke for the latter. e

The foregoing operation is to be carried out duriinfilthe compression stroke of the en" ginea emechanism is so connected with the engine to provide for its operation'at the riod as referred to. The pl Y r 25, after.

its fuel expellin' stroke will be. eld tightly against lug 26 y 64 and 74, to preventl'anda 'cose'ports'45. The port 27 in plug provides the outlet for l'x aThe cpntr'olshift th kc f g Permits r ius g c n re 0' the pump, 'due'tofthe' fact that such elements. providefor p p 82 so that the duration of the travelling 0011-. tact of the nomwithfthe camwill varyto change the-operatin stroke of the puin '7 be short the ump that the stro of that the travelling be long it inobvious pum 'willbeincreased.

atIclaimis:

:1. In a fuel pumping mechanism forinconnection with pawl70 relative to cam ternal combustion engines, a tubular structure having a part thereof of uniform inner diameterto provide a chamber for afuel in--' takeand expelling plunger, said chamber bei 1n open at its inner end, a-no closed f va ve controlled fuel outlet structure secured to the tubular structure and having-a reduced 1 portion extending into the outer portion and abutting the inner face of said: art to provide a normally closed a outer wall I for said chamber, said tubular ineluding a valve controlled fuel intake nor-- mall closed to a source of fuel su ply, said inta e a inwardly of an in very close proximity to said wall, at

right angles to the latter and opening into said chamber at the extreme outer end of plunger for intakin fuel into and for expelling it from sai mechanism, abutment means carriedv by and at each side of. one end of the plunger inwardly of said structure, a 5 pivot arranged adjacent to and forwardlyof said means, an actuable pawl pivotally mounted intermediate its ends on said pivot, said pawl including a bifurcated inner part bearing against said members for intermittently imparting a fuel intake stroke to the plunger against the action of the controlling spring for said structure, said pawl having its outer end provided with a depending nose, a rotatable cam arranged outwardly w1th respect to said pivot and coacting with said nose to actuate the pawl in a dlrection for intermittently imparting a fuel intake stroke to the plunger, said driving structure includingme'ans for intermittently imparting an expelling stroke to said plunger, a coiled spring encompassing the plunger and interposed between said structure and inner part of said pawl, said pivot being adjustable for varying the stroke of the plunger, means integral with the pivot for adjusting it, and supporting means common to said pivot and adjusting means.

In testimony whereof, I afiix my signature ereto. HARRY A. 

